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8 files changed

+170
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‎_13_cookie_session/src/main/java/com/atguigu/servlet/CookieServlet.java‎

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@@ -11,6 +11,14 @@
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public class CookieServlet extends BaseServlet {
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protected void testPath(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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Cookie cookie=new Cookie("path1","path1");
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// req.getContextPath() 获取工程路径
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cookie.setPath(req.getContextPath()+"/abc");// ===>>> 设置地址: /工程路径/abc
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resp.addCookie(cookie);
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resp.getWriter().write("创建了一个带有Path路径的Cookie");
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}
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/**存活一小时的cookie
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*
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* @param req
@@ -78,6 +86,7 @@ protected void updateCookie(HttpServletRequest req, HttpServletResponse resp) th
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// resp.getWriter().write("key1的Cookie修改好了");
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//2.先找到需要的Cookie ,再修改
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//传入待查找的cookie的key 和 cookie集合 然后找到了就用新的value覆盖旧的value
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Cookie cookie=CookieUtils.findCookie("key2",req.getCookies());
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if(cookie!=null){
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cookie.setValue("newValue2");

‎_13_cookie_session/src/main/java/com/atguigu/servlet/LoginServlet.java‎

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package com.atguigu.servlet;
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import javax.servlet.ServletException;
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import javax.servlet.http.Cookie;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import java.io.IOException;
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public class LoginServlet extends HttpServlet {
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protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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String username=req.getParameter("username");
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String password = req.getParameter("password");
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//检查用户名和密码, 如果正确就登录
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if ("wzg168".equals(username)&&"123456".equals(password)){
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//用cookie保存当前用户名
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Cookie cookie = new Cookie("username", "wzg168");
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cookie.setMaxAge(60*60*24*7);//保存7天记录
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resp.addCookie(cookie);
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System.out.println("登录成功");
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}else{
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System.out.println("登录失败");
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}
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}
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}

‎_13_cookie_session/src/main/java/com/atguigu/servlet/SessionServlet.java‎

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package com.atguigu.servlet;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import javax.servlet.http.HttpSession;
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import java.io.IOException;
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public class SessionServlet extends BaseServlet{
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/** 往session域中保存保存数据
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*
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* @param req
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* @param resp
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* @throws ServletException
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* @throws IOException
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*/
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protected void setAttribute(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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//getSession()第一次是创建Session,之后调用都是获取之前创建的Session
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req.getSession().setAttribute("key1","value1");
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resp.getWriter().write("已经往Session域中保存了数据");
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}
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/** 从Session域中获取数据
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*
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* @param req
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* @param resp
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* @throws ServletException
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* @throws IOException
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*/
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protected void getAttribute(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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Object attribute= req.getSession().getAttribute("key1");
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resp.getWriter().write("从Session域中获取到的key1的数据是:"+attribute);
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}
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/** 创建或获取 Session
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*
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* @param req
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* @param resp
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* @throws ServletException
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* @throws IOException
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*/
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protected void createOrGetSession(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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//创建和获取Session会话对象
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HttpSession session=req.getSession();
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//判断当前session是否是新创建的
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boolean isNew=session.isNew();
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//获取Session唯一标识id
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String id= session.getId();
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resp.getWriter().write("得到的Session,它的id是:"+id +"<br/>");
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resp.getWriter().write("这个Session是否是新创建的:"+isNew +"<br/>");
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}
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protected void defaultLife(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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int maxInactiveInterval = req.getSession().getMaxInactiveInterval();//默认生命周期
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//这里超时时长是1800秒即30分钟 ,因为tomcat的web.xml文件里 有默认配置:
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/*
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<session-config>
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<session-timeout>30</session-timeout>
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</session-config>
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*/
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//如果要改的话,直接在idea的xml文件里改就行 ,单独作用于当前xml的话就利用上面的api,getMaxInactiveInterval(int )
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resp.getWriter().write("Session的默认超时时长为"+maxInactiveInterval+ "秒");
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}
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protected void life3(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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HttpSession session = req.getSession();
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req.getSession().setMaxInactiveInterval(3);
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resp.getWriter().write("已经设置超时时长为3秒");
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}
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protected void deleteNow(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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HttpSession session = req.getSession();
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req.getSession().invalidate();
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resp.getWriter().write("已经设置session为无效");
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}
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}

‎_13_cookie_session/src/main/webapp/WEB-INF/web.xml‎

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<servlet-name>CookieServlet</servlet-name>
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<url-pattern>/cookieServlet</url-pattern>
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</servlet-mapping>
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<servlet>
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<servlet-name>LoginServlet</servlet-name>
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<servlet-class>com.atguigu.servlet.LoginServlet</servlet-class>
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</servlet>
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<servlet-mapping>
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<servlet-name>LoginServlet</servlet-name>
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<url-pattern>/loginServlet</url-pattern>
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</servlet-mapping>
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<servlet>
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<servlet-name>SessionServlet</servlet-name>
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<servlet-class>com.atguigu.servlet.SessionServlet</servlet-class>
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</servlet>
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<servlet-mapping>
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<servlet-name>SessionServlet</servlet-name>
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<url-pattern>/sessionServlet</url-pattern>
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</servlet-mapping>
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<session-config>
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<session-timeout>40</session-timeout>
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</session-config>
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</web-app>

‎_13_cookie_session/src/main/webapp/cookie.html‎

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<li><a href="cookieServlet?action=life3600" target="target">Cookie存活3600秒（1小时）</a></li>
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</ul>
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</li>
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<li><a href="" target="target">Cookie的路径设置</a></li>
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<li><a href="cookieServlet?action=testPath" target="target">Cookie的路径设置</a></li>
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<li><a href="" target="target">Cookie的用户免登录练习</a></li>
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</ul>
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</div>

‎_13_cookie_session/src/main/webapp/login.jsp‎

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<%--
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Created by IntelliJ IDEA.
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User: 强风吹拂
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Date: 2023/6/21
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Time: 15:06
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To change this template use File | Settings | File Templates.
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--%>
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<%@ page contentType="text/html;charset=UTF-8" language="java" %>
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<html>
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<head>
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<title>Title</title>
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</head>
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<body>
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<form action="http://localhost:8080/_13_cookie_session/loginServlet" method="get">
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用户名 : <input type="text" name="username" value="${cookie.username.value}"><br>
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密码 : <input type="password" name="password" ><br>
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<input type="submit" value="登录">
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</form>
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</body>
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</html>

‎_13_cookie_session/src/main/webapp/session.html‎

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}
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</style>
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<base href="http://localhost:8080/_13_cookie_session/">
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</head>
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<body>
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<iframe name="target" width="500" height="500" style="float: left;"></iframe>
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<div style="float: left;">
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<ul>
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<li><a href="" target="target">Session的创建和获取（id号、是否为新创建）</a></li>
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<li><a href="" target="target">Session域数据的存储</a></li>
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<li><a href="" target="target">Session域数据的获取</a></li>
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<li><a href="sessionServlet?action=createOrGetSession" target="target">Session的创建和获取（id号、是否为新创建）</a></li>
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<li><a href="sessionServlet?action=setAttribute" target="target">Session域数据的存储</a></li>
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<li><a href="sessionServlet?action=getAttribute" target="target">Session域数据的获取</a></li>
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<li>Session的存活</li>
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<li>
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<ul>
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<li><a href="" target="target">Session的默认超时及配置</a></li>
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<li><a href="" target="target">Session3秒超时销毁</a></li>
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<li><a href="" target="target">Session马上销毁</a></li>
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<li><a href="sessionServlet?action=defaultLife" target="target">Session的默认超时及配置</a></li>
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<li><a href="sessionServlet?action=life3" target="target">Session3秒超时销毁</a></li>
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<li><a href="sessionServlet?action=deleteNow" target="target">Session马上销毁</a></li>
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</ul>
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</li>
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<li><a href="" target="target">浏览器和Session绑定的原理</a></li>

‎book/src/main/java/com/atguigu/web/BookServlet.java‎

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page.setUrl("manager/bookServlet?action=page");
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//page.serUrl("manager/bookServlet?action=page");
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//3.保存page对象到Request域中
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req.setAttribute("page",page);

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